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The STUDIA UNIVERSITATIS BABEŞ-BOLYAI issue article summary
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Abstract: Fifteen soil samples from the Parâng Mountain in the South-Eastern part of the Hunedoara county, from five altitudinal vegetation zones (alpine, subalpine, conifers, beech and flood plain) have been analyzed microbiologically and enzymologically. The microbiological analyses consisted in the study of the abundance, dynamics, diversity and ecological significance of the bacterial groups involved in the biogeochemical cycles of carbon and nitrogen: aerobic mesophilic heterotrophs, ammonifiers, denitrifiers, nitrate and nitrite bacteria. Based on the obtained results, the bacterial indicator of the soil quality (BISQ) was calculated for each type of soil in each altitudinal vegetation zones. In order to have a complete image on the complex microbial processes in these habitats, these analyses have been completed with enzymological researches which make possible the appreciation of evolution of the soil types. The phosphatase, catalase, actual and potential dehydrogenases activities have been studied in all the soil samples. The studied activities were detected in all the 5 altitudinal vegetation zones, with differences noticed only as regard the intensity of the processes. Based on the absolute values of the enzymatic activities, the enzymatic indicator of soil quality (EISQ) was calculated. The EISQ values ranged between 0.314 and 0.430, indicating a moderate intensity of the enzymatic activities. A positive correlation between the bacterial and enzymatic indicators of soil quality (r = + 0.976) was established. |
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